I've been going over thread after thread trying to get the air out of my cooling system with no luck. I have access to Ford's tech service so I finally found their recommended way to burp the system without having their special tool, and here it is word for word. This worked perfectly and now all the air is out, plus it's much easier!!!
Remove the fill plug in the crossover tube on top of the engine.
- Check all hose clamps for correct tightness. Make sure the radiator draincock is closed.
- Remove the coolant bottle cap and fill the degas bottle to the add coolant line.
- Install the cap.
Remove the fill plug in the crossover tube on top of the engine.
- Using a funnel, add coolant to the crossover port, keeping the level of coolant in the funnel at 1/4 full.
- Squeeze the 2 large upper cooling system hoses 5 times. Bubbles may appear in the funnel as air exits the system.
- Start the engine and run for 5 minutes while monitoring the coolant in the funnel.
- A sudden drop in the funnel level indicates the elimination of air in the system.
- Shut off the engine and let it cool for 10 minutes.
- Crack open the degas bottle cap enough to allow the coolant level in the funnel to drop to within 1 inch of the bottom of the funnel.
- Tighten the cap.
- Remove the funnel and install the fill plug in the crossover tube.
- Add coolant in the degas bottle to the full coolant line.
- Repeat the filling procedure if necessary.
